I've had an insanely strong stomach all my life in regards to motion sickness (as in I could read a book in the aft cabin of a sailboat with 5 ft. waves and feel nothing), but in October I went on a rollercoaster that in previous experiences never bothered me, but this time I felt sicker and sicker as the ride went on. I didn't actually get sick, but I haven't been able to think about going on another rollercoaster since, and I am now worrying about travelling situations that would not have bothered me before this experience. My dad has a small airplane, and I used to go flying with him but now I'm too worried, as the last time I went I felt sick, but I think that might have been more due to panic because of the rollercoaster experience a month earlier.
So, in short, is it possible to develop motion sickness later in life, or are you just born with it? Is it possible nerves just got to me and now I'm stressing over nothing, and the rollercoaster thing was a one time deal?